DIAMOND COLOR MASTER Nano-Technology Diamond Color Grading Set, Available in one carat size, a set of 10 stones (color range from E-N). Comes with an attractive case and reference color weight sheet for all the stones. The unique grading display/container is made of color grading-approved white acrylic & is equipped with a built-in grading tray. All stones are laser inscribed with Color Letters for easy identification and handling.